file_server/file_server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    run s3 file server within Samba4
   5
   6    Copyright (C) Andrew Tridgell        2011
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "talloc.h"
  24 #include "tevent.h"
  25 #include "system/filesys.h"
  26 #include "lib/param/param.h"
  27 #include "source4/smbd/service.h"
  28 #include "source4/smbd/process_model.h"
  29 #include "file_server/file_server.h"
  30 #include "dynconfig.h"
  31 #include "nsswitch/winbind_client.h"
  32
  33 /*
  34   called if smbd exits
  35  */
  36 static void file_server_smbd_done(struct tevent_req *subreq)
  37 {
  38         struct task_server *task =
  39                 tevent_req_callback_data(subreq,
  40                 struct task_server);
  41         int sys_errno;
  42         int ret;
  43
  44         ret = samba_runcmd_recv(subreq, &sys_errno);
  45         if (ret != 0) {
  46                 DEBUG(0,("file_server smbd daemon died with exit status %d\n", sys_errno));
  47         } else {
  48                 DEBUG(0,("file_server smbd daemon exited normally\n"));
  49         }
  50         task_server_terminate(task, "smbd child process exited", true);
  51 }
  52
  53
  54 /*
  55   startup a copy of smbd as a child daemon
  56 */
  57 static void s3fs_task_init(struct task_server *task)
  58 {
  59         struct tevent_req *subreq;
  60         const char *smbd_path;
  61         const char *smbd_cmd[2] = { NULL, NULL };
  62
  63         task_server_set_title(task, "task[s3fs_parent]");
  64
  65         smbd_path = talloc_asprintf(task, "%s/smbd", dyn_SBINDIR);
  66         smbd_cmd[0] = smbd_path;
  67
  68         /* the child should be able to call through nss_winbind */
  69         (void)winbind_on();
  70         /* start it as a child process */
  71         subreq = samba_runcmd_send(task, task->event_ctx, timeval_zero(), 1, 0,
  72                                 smbd_cmd,
  73                                 "-D",
  74                                 "--option=server role check:inhibit=yes",
  75                                 "--foreground",
  76                                 debug_get_output_is_stdout()?"--log-stdout":NULL,
  77                                 NULL);
  78         /* the parent should not be able to call through nss_winbind */
  79         if (!winbind_off()) {
  80                 DEBUG(0,("Failed to re-disable recursive winbindd calls after forking smbd\n"));
  81                 task_server_terminate(task, "Failed to re-disable recursive winbindd calls", true);
  82                 return;
  83         }
  84         if (subreq == NULL) {
  85                 DEBUG(0, ("Failed to start smbd as child daemon\n"));
  86                 task_server_terminate(task, "Failed to startup s3fs smb task", true);
  87                 return;
  88         }
  89
  90         tevent_req_set_callback(subreq, file_server_smbd_done, task);
  91
  92         DEBUG(5,("Started file server child smbd\n"));
  93 }
  94
  95 /* called at smbd startup - register ourselves as a server service */
  96 NTSTATUS server_service_s3fs_init(TALLOC_CTX *);
  97
  98 NTSTATUS server_service_s3fs_init(TALLOC_CTX *ctx)
  99 {
 100         struct service_details details = {
 101                 .inhibit_fork_on_accept = true,
 102                 .inhibit_pre_fork = true
 103         };
 104         return register_server_service(ctx, "s3fs", s3fs_task_init, &details);
 105 }